Apparatus for simultaneously cooling cement clinker and extracting moisture from slurry



L. E. PALMER 1,937,094

Nov. 28, 1933.

APPARATUS FOR SIMULTANEOUSLY COOLING CEMENT CLINKER AND EXTRACTING MOISTURE-FROM SLURRY Filed June 15, 1931 INVENTOR [es terifa 277: er

ATTO RN EY-S' Patented Nov. 28, 1933 f we e Y e 1,937,094 q H V v APPARATUS FOR SIMULTANEUSLY COOL- ING CEMENT CLINKER AND EXTRACTING MQISTURE FROM 'SLURRY w Lester E. Palmer; Osborn, Ohio, a ssignor of one half to Wabash Portland CementCompany, Detroit, Mich.,a corporation oflndia'na Application June1 5 1931. serial-natures roams; (01.' 222 The invention relates to the manufacture-of Portland cement and has for its object 'the' ob- I taining of greater efliciency by the utilization of waste heat for the extraction of moisture. It is' a further object to obtain thiswaste heat from the hot clinker which is therefore more quickly cooled and'improved in quality. With-these'objects in view the inventioncon'sists in the method and apparatus as-liereinafter 'set forth;

In the'drawing: 7 Figure 1 is a longitudinal section through-a portion of the apparatus} Figure 2 is a cross section thereof.

In the manufacture of Portland cement, one method extensively used is to introduce the mixed ingredients into the kiln with a relatively large amount of water, the mixture being commonly known as slurry. All of the water so introduced must be evaporated before the solid ingredients can be brought to the proper temperature and this requires the expenditure of heat. On the other hand, the cement is discharged from the kiln in the form of highly heated clinker which must be cooled 'and the quality of this clinker is I improved by comparatively rapid cooling. With my improvement the waste heat in the clinker is utilized for partially drying or extracting a certain portion of the moisture from the slurry so as to require less heat for its complete drying. The apparatus preferably employed for carrying out this method consists in a revolving cyl-, inder A having its axis slightly inclined so as to cause the feeding of material introduced therein from one end to the other. The periphery of this cylinder is surrounded with a series of heat conducting fins which may either be solid such as B or hollow as at C. Segments of these fins dip into a series of troughs D, D, etc., which are separated by partitionsE, E, etc., of progressively diminished height so as to permit the overfiow of slurry from one compartment to the other. Where the hollow fins C are employed the drum A is provided with a series of small apertures F communicating with the interior of this fin and -of sufficient size to permit the clinker to pass I therethrough. The annular chamber 'within the fins is also divided by radial partitions G into a number of compartments, four being shown in the construction illustrated. Larger apertures H are arranged at one end of each of these compartments to more readily permit the passage of clinkers so as to insure its complete discharge from the compartment in the fin at (a certain point in the cycle.

. With an apparatus constructed as described the reaches the lowest one J: The hot clinker directly" A slurry is fed into the upper end of the series of troughs through aconduit I and will progressively overflow ,fromoiie trough to another until it i from thekiln isintroduced into the upper end. of the cylinder A and during the revolution of; the latter will slowly travel down thejinclineand'will pass through theapertures F intoithe hollow fins.

The heat of theclinker is thus communicated "to"- the side walls of the'fins' which are dipped in the causing evaporationof the moisture-f The slurry as it passes from trough to trough is progressively thickened by loss of moisture so that in the lowerthe clinker is progressively moved downward'towards the. discharge end of the cylinder and when discharged'is greatly lower in temperature.

The fins in passing through the slurry will re,-' tain a certain amount thereof adhering to the side walls whichwill become dried and would 65 i slurry, communicating theheat tothe latter andeventually build up a thick coating. This result isprevented by arranging at one point in the revolution a series of scrapers K and L engaging the periphery and side walls of the fins and removingthe adhering coating therefrom. The material so removed may be either mixed with the'wet slurry or separately introduced into the kiln. v

While I prefer to use the hollow fins in the manner described, a beneficial effect is obtained even where the fins are solid asindicated at B. 1 Also, instead of making the cylinder A as a dise tinct unit from the kiln; it is obvious that it might be made as a forward extension of the kiln beyond 3 the heating zone. In each case, the hot'clinker will be;cooled and the heat abstracted therefrom will be used in'drying the slurry.

What I claim as my inventioniis; e 1. An apparatus for simultaneously cooling cement clinker and extracting moisture from-slurry comprising a revoluble cylinder through which the hot'clinker is fed, heat conducting fins projecting from the periphery ofsaid cylinder and receptacles for the slurry through which'said fins are passed. v

2. An apparatus for simultaneoue i ment clinker and extracting moisture from slurry comprisinga revoluble' cylinder through which the hot'clinker is passed, a series of heat conducting fins projecting from the periphery of said cylinder, and a series of containers for the slurry through which the respective fins are passed, 7 j

3. An apparatus forsimultaneously:cooling cement clinker and extracting moisture from slurry comprising a revoluble cylinder having its axis slightly inclined downward through which the, hot clinker is passed, a series of fins projecting from the periphery of said cylinder 'atcontainerr for the slurry having a seriesiofitroughs:orrcome-u partments of progressively diminishing height' -to 7 permit of overflow of the slurry frpmpne come a containerfon the slurry- -having seriesof come partments into ,which segmentsiof theerespective;

fins are; dipped I and scrapers for removing. the adhering material from the=fins- -at one-pointinthe revolutionof 1 the cylinder.

5: An vapparatus for simultaneously. cooling cement: clinker and .extractingmoisture from slurry comprising; a J revoluble cylinder. through whichi the-hotxclinker isrpassed; a series, ,of hollow annular;- fins: projecting, from; theiperiphery, of; the 0371? ind'er; theswalls; of the; latter. being; apertured;

for communication between the interior'of the cylinder and the interior of the fins to permit the passage of clinker, and a container for the slurry into which segments of said fins are dipped.

6. Anapparatus for simultaneously, cooling cement "clinkenaridf extracting ,moisturlefromislurry comprising a cylinder through which the hot clinkeris passed, a series of hollow annular fins projecting from the periphery of the cylinder, the walls of the latter being apertured for com- 7 municationpbetweemthe interior of the cylinder and'ithe interion-ofithe fins, and radial partitions for: dividing. the annular space within the fins into. segments.

'72.An apparatussforisimultaneously cooling cementiclinkerrand extracting moisture from slurry comprising a revoluble cylinder having its axis slightlyinclined from the horizontal and throughrwhich the hot clinker is passed, a series of hollow annular fins projecting from the pe-. riphery; of r saidcylinder, the; wallsn of the 5 latter being apertured for the! passage :of clinkerzrintm thev chamber: withina the fins;v radial.=. partitionsi for dividing theiannularispaceintozseggnents with; the cylinden wall.- at;

an enlarged aperture in; one=.end. of; each; segment; ion the discharge Of 'i clinker; therethrough; and; a receptacle; $012", the; slurry; having 1 as series of comnartmentsdor re? ceiving segments, of they respectiveAims. and:

ranged to permit overflow of theislurryyfronrone compartmentttozthe otheri, 

